when my friend attend her n-400 ( 3 year marriage) interview, her husband is in korea for active duty. she brought the order, but the person who checked her in in jacksonville,FL refused to let her in. after back and forth exchange, the same person asked other staff to handle the situation, the IO actually came out and let her in. the IO was a military and one time has been stationed in korea so he gets it. she actually got on the spot oath ceremony that day. good luck